TM 1-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
trol to determine exact error.
Correct on ground, if neces-
sary, before further in-flight
calibration.
(7) TILT control - Push in to
restore stabilization.
(8) Verify that pattern does not
change. If the pattern shifts
either left or right, ground
check leveling of the gyro and
accuracy of the horizon indi-
cator. Use TILT control to
find exact error.
(9) Roll the aircraft 20° right. For
perfect stabilization, the pat-
tern should not shift.
(10) If the terrain band shifts to
the right around the second
range marks, increase tilt
angle using TILT control
until pattern is displayed
throughout the third range
marks. Note new position of
TILT control. Verify that tilt
is no more than two degrees
above that noted in step (5).
(11) If the terrain band shifts (in
step 8) to the left around the
second
range
marks,
decrease tilt angle using
TILT control until pattern is
displayed throughout the
third range marks. Note new
position of TILT control.
Verify that tilt is no more
than two degrees below that
noted in step (5).
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